Added German Translations (#406)

* Added German Translations

Translated using
https://docs.djangoproject.com/en/1.9/topics/i18n/translation/

Added language drop down menu's for base.html, registration & login
pages

Known issues:
* Translated items in whtracker>create signature remain translated when
posted
* No date/time localisation for Fleet/Structure timers

* Added time locale

Added date/time locale to
*Structure Timers
*Fleet Timers
*Fleet timer form datetimepicker.js

Fixed a bug where the bootstrap label didn't show up when making a
structure timer using the translated form

Missed some base.html translations

* Small translation error

Some obscure SRP strings went unnoticed for context review

* FAT & Fleet-up German Translations

+ a fix in settings.py.example

The only small thing not done is German Date/Time locale for Fleet-up

* Compiled de/django.po

stock/templates/registered/hrapplicationcorpchoice.html

@@ -1,13 +1,15 @@
 {% extends "public/base.html" %}
 {% load staticfiles %}
+{% load i18n %}
+
 {% block title %}Choose a Corp{% endblock %}
-{% block page_title %}Choose a Corp{% endblock page_title %}
+{% block page_title %}{% trans "Choose a Corp" %}{% endblock page_title %}
 {% block content %}
     <div class="col-lg-12">
-        <h1 class="page-header text-center">Choose a Corp</h1>
+        <h1 class="page-header text-center">{% trans "Choose a Corp" %}</h1>
         {% if choices %}
             <div class="panel panel-primary">
-                <div class="panel-heading">Available Corps</div>
+                <div class="panel-heading">{% trans "Available Corps" %}</div>
                 <table class="table table-responsive">
                     {% for choice in choices %}
                         <tr>
@@ -19,7 +21,7 @@
                 </table>
             </div>
         {% else %}
-            <div class="alert alert-danger">No corps are accepting applications at this time.</div>
+            <div class="alert alert-danger">{% trans "No corps are accepting applications at this time." %}</div>
         {% endif %}
     </div>
 {% endblock content %}